<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style type="text/css">
        .box div{
            padding: 20px;
        }
        .box1{
            width: 100px;
            height: 100px;
            background-color: red;
        }
        .box2{
            width: 300px;
            height: 200px;
            background-color: orange;
        }
        .box3{
            width: 200px;
            height: 150px;
            background-color: yellow;
        }
        .box4{
            width: 400px;
            height: 5px;
            background-color: skyblue;
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="box1"></div>
        <div class="box2"></div>
        <div class="box3"></div>
        <div class="box4"></div>
    </div>
</body>
</html>